The 2023 Kastner Cup is coming to Road America. The Kastner Cup will be the featured marque of the 2023 WeatherTech International Challenge with Brian Redman. One of the largest vintage race car gatherings in the United States, featuring over 50 classes of cars racing in several groups, The WeatherTech International Challenge with Brian Redman will return on July 13-16, 2023. A mid-summer classic including everything from a special Concours on Friday and Saturday along the streets of Elkhart Lake and a special Triumph sports car racer reunion makes the 2023 event a can’t miss spectacle for any racing enthusiast.